AD7940 3 mW, 100 kSPS, 14-Bit ADC in 6-Lead SOT-23

The AD79401 is a 14-bit, fast, low power, successive approximation ADC. The part operates from a single 2.50 V to 5.5 V power supply and features throughput rates up to 100 kSPS. The part contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 7 MHz.

The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and the conversion is also initiated at this point. There are no pipelined delays associated with the part.

The AD7940 uses advanced design techniques to achieve very low power dissipation at fast throughput rates. The reference for the part is taken internally from VDD, which allows the widest dynamic input range to the ADC. Thus, the analog input range for this part is 0 V to VDD. The conversion rate is determined by the SCLK frequency.

This part features a standard successive approximation ADC with accurate control of the sampling instant via a CS input and once off conversion control.

Features and Benefits
  • Fast throughput rate: 100 kSPS
  • Specified for VDD of 2.5 V to 5.5 V
  • Low power
    4 mW typ at 100 kSPS with 3 V supplies
    17 mW typ at 100 kSPS with 5 V supplies
  • Wide input bandwidth:
    81 dB SINAD at 10 kHz input frequency
  • Flexible power/serial clock speed management
  • No pipeline delays
  • High speed serial interface
  • SPI®/QSPI™/MICROWIRE™/DSP compatible
  • Standby mode: 0.5 μA max
  • 6-Lead SOT-23 and 8-Lead MSOP packages
  • 6-Lead SOT-23 and 8-Lead MSOP packages
  • Standby Mode: 0.5 µA max
Analog to Digital Converters
Data Sheets
Documentnote
AD7940: 3 mW, 100 kSPS, 14-Bit A/D Converter in 6-Lead SOT-23 Data Sheet (Rev. A)PDF 480 kB
Application Notes
Documentnote
AN-931: Understanding PulSAR ADC Support Circuitry (Rev. 0)PDF 299 kB
Product Highlight
Documentnote
8- to 18-Bit SAR ADCs ... From the Leader in High Performance AnalogPDF 1885 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7940BRJZ-REEL7 Production6 ld SOT-23REEL 3000-40 to 85C05.06E
AD7940BRM Last Time Buy8 ld MSOPOTH 50-40 to 85C00N
AD7940BRM-REEL7 Last Time Buy8 ld MSOPREEL 1000-40 to 85C00N
AD7940BRMZ Production8 ld MSOPOTH 50-40 to 85C6.035.06Y
AD7940BRMZ-REEL7 Production8 ld MSOPREEL 1000-40 to 85C05.06Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
EVAL-AD7942-PMDZEvaluation Board PMOD compatible form factor27Y
EVAL-AD7942SDZEvaluation Board SDP Interface99Y
EVAL-SDP-CB1ZEvaluation Controller Board SDP99Y
SDP-PMD-IB1ZEvaluation Interposer Board PMOD to SDP w/ Power Supply55Y
Reference Materials
AD7940: 3 mW, 100 kSPS, 14-Bit A/D Converter in 6-Lead SOT-23 Data Sheet (Rev. A) ad7940
AD7940参考代码 ad7940
AN-931: Understanding PulSAR ADC Support Circuitry (Rev. 0) ad7476
AN-931: 了解PulSAR ADC支持电路 (Rev. 0) ad7476
8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog ad7893
MS-2210:高速ADC的电源设计 ad9861